Years ago I had a friend that groundhog hunted with an 06. We tried alot of bullets and the litest bullet we found that shot well at over 100 yrds. was the 130 gn. Speer HP. Some bullets would shoot good to 75 or 100 yrds. but farther than that would open up very fast and most were not accurate enough to kill groundhogs reliable at 150 yrds. The 130 Speers would group farther than you could guess the hold over, in those days we didn`t have range finders.